I need to attach the red backing board to the three front layers which are glued together, and it needs to be removable on the rare occasions I may need to access the wiring inside. I could screw it on, but the layers are only 1/8" with the middle layer being acrylic, so I don’t know how well it’d hold up. (I guess I could cut a hole through the acrylic and go a bit into the top plate as well, but that’s still pretty thin.) So my idea was to embed a nut in a little recess between the layers and use a small machine screw. Would this work, or am I overthinking it and screwing it on would be fine for occasional access? Or is there another better option maybe?
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Is the application static? If so, tapping the acrylic (before assembly) and threading into it directly might be sufficient for the rare times it needs to be disassembled for repair.
A small nut would certainly be more robust.
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Had a late thought - what about riv-nuts?
I don’t know all the sizes but I’ve seen them used on sheet metal, so you could secure them to the lower layer of wood and just leave holes in the acrylic above for the bolts to poke into?
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I like your idea. It’s classy. 
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Yes, I use that same technique when I 3D print. I create a space in the print for the nut and when the print gets to the layer flush with the top of the nut, I pause the print and drop the nut in. It works very nicely. I also insert captive magnets the same way. Thank goodness the printer head is completely non-ferrous.
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That should work fine. Your design already shows the critical matter of making that screw captive instead of relying on adhesive to keep it in place. Go for it.
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Does your backing board cover the entire back? As an alternate option, is there room in the frame for permanently mounted turn buttons?
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Yeah, it covers the whole back and the wood strip it attaches too is pretty narrow, so I don’t think there’d be any room to attach turn buttons. It sure would be a simper solution to it though, so I’ll take another look to see if I could make them work.
@tjleasa Good to hear it works! If the simpler solution won’t work, I’ll hunt up what itty-bitty screws I’ll need.
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